When your significant other(s) come to you with brain weasels, no matter how crazy the brain weasel is, do not shame them for bringing up their brain weasels. Period.
Brain weasels, linguistically, are their own entities. By naming them as something other than your sweetie, you’ve managed to address the problematic behavior without actually blaming the person.
Weasels are cute. They are smart. They will also eat your face off, if given the chance.